DS1666S

The DS1666 is a solidstate potentiometer which is setto value by digitally controlled resistive elements. The potentiometer is composed of 127 resistive sections.Between each resistive section and both ends of the potentiometerare TAP points accessible to the wiper. Theposition of the wiper on the resistance array is controlledby the CS , U/D and INC inputs. The position of the wiperdefaults to the 10% position on power up. The resolutionof the DS1666 is shown in Figure 1.

The DS1666 Digital Audio Resistor is uniquely designedto provide a potentiometer that is logarithmic rather thanlinear across its entire range. The lower half of the potentiometeradvances 1% of total resistance for each3% of scale advanced, providing for precise amplificationof low volume signals. The upper half of the potentiometeradvances 2% of resistance for every 1% ofscale advanced, providing for the lower resolution gainrequired for high volume amplification.